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Impairment of Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 Security Bank | Mar. 31, 2012 | Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Other than temporary impairment charges recognized | $ 0 |  | $ 0 |  |
Non-credit related gains on securities not expected to be sold (recognized in other comprehensive income) | 1,864,000 |  | 1,498,000 |  |
Continuous Unrealized Loss Position, Fair Value | 337,495,000 |  |  |  | 158,949,000
Amortized Cost | 1,297,923,000 |  |  |  | 1,169,613,000
Estimated Fair Value | 1,297,203,000 |  |  |  | 1,171,303,000
Number of banks and other financial institutions comprising the security | 319 |  |  |  |
Number of pooled securities representing senior tranches | 2 |  |  |  |
Number Of Pooled Securities with No Senior Class | 4 |  |  |  |
Amount of pooled issues that remained above investment grade | 1,200,000 |  |  |  |
Number of securities with no excess subordination | 7 |  |  |  |
Number of Securities with Excess Subordination | 5 |  |  |  |
Coupon rate | 7.00% |  |  |  |
Probability of default | 100.00% |  |  |  |
Projected recovery rate | 0.00% |  |  |  |
Probability percentage assigned to default bank subject to market indicators | 10.00% |  |  |  |
Probability percentage assigned to default bank | 100.00% |  |  |  |
Other than temporary impairment, credit losses recognized in earnings | 283,000 | [1] | 235,000 | [1] |
Minimum [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Subordinated tranches range | 7.00% |  |  |  |
Total principal amount of the respective securities | 5.00% |  |  |  |
Excess subordination as a percentage of current performing collateral | 11.00% |  |  |  |
Probabilities for performing collateral range | 0.33% |  |  |  |
Excess present value of future cash flows over our current book value | 6.00% |  |  |  |
Maximum [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Subordinated tranches range | 35.00% |  |  |  |
Excess subordination as a percentage of current performing collateral | 631.00% |  |  |  |
Probabilities for performing collateral range | 75.00% |  |  |  |
Excess present value of future cash flows over our current book value | 154.00% |  |  |  |
Trust preferred collateralized debt obligations [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Other than temporary impairment charges recognized | 0 |  | 0 |  |
Percent of unrealized losses | 92.00% |  |  |  |
Percentage of Current Performing Collateral | 0.00% |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Amortized Cost | 6,700,000 |  |  |  | 6,703,000
Estimated Fair Value | 6,973,000 |  |  |  | 6,991,000
Pooled Trust Preferred Securities [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Other than temporary impairment charges recognized | 0 |  | 0 |  |
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Percent of unrealized losses | 8.00% |  |  |  |
Equity Securities [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Other than temporary impairment charges recognized | 0 |  | 0 |  |
Continuous Unrealized Loss Position, Fair Value | 0 |  | 0 |  |
Asset Size and Coupon Rate 1 [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Collateral issued by financial institutions | 15,000,000,000 |  |  |  |
Prepayment rate | 100.00% |  |  |  |
Coupon rate | 7.00% |  |  |  |
Asset Size and Coupon Rate 2 [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Coupon rate | 7.00% |  |  |  |
Fair Value Inputs , Prepayment Rate Year One and Two | 40.00% |  |  |  |
Fair Value Inputs , Prepayment Rate After Year Two | 2.00% |  |  |  |
Asset Size and Coupon Rate 3 [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Prepayment rate | 5.00% |  |  |  |
Asset Size and Coupon Rate 3 [Member] | Minimum [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Collateral issued by financial institutions | 2,000,000,000 |  |  |  |
Asset Size and Coupon Rate 3 [Member] | Maximum [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Collateral issued by financial institutions | 15,000,000,000 |  |  |  |
Asset Size and Coupon Rate 4 [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Collateral issued by financial institutions | $ 2,000,000,000 |  |  |  |
Prepayment rate | 5.00% |  |  |  |
Coupon rate | 10.00% |  |  |  |
Asset Size and Coupon Rate 5 [Member] |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Prepayment rate | 0.00% |  |  |  |
[1] | Represents the increase in cash flows recognized in interest income during the period.

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- Definition Before tax amount of other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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